fix(companion): also clear stale contact refs on silent auto-eviction

onContactOverwrite() (the contact-table-full LRU eviction path) deleted the
contact's blob and notified the companion app, but never called the new
onContactRemoved() cleanup -- so a Favourites Dial slot, Locator target, or
Live Share target could still go stale, just via the silent auto-evict path
instead of an explicit removal. This is likely the main real-world cause of
the "(gone)" tile the docs described, since auto-eviction happens far more
often than an explicit CMD_REMOVE_CONTACT.

Also sync the two docs that described the old (now wrong) behaviour:
Locator's "survives delete" claim, and Favourites Dial's "(gone) until
reassigned" claim.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/solo_features/favourites_dial/favourites_dial.md

@@ -29,7 +29,7 @@ Navigate tiles with **UP / DOWN / LEFT / RIGHT**. Pressing a directional key at
 
 Filled tiles show an unread message count in the top-right corner when there are unread DMs from that contact. The contact name is ellipsized to make room for the badge.
 
-If a pinned contact has been removed from the contacts list, the tile shows `(gone)` until the slot is reassigned.
+If a pinned contact is removed from the contacts list — explicitly, or auto-evicted to make room when the table is full — its slot is freed automatically and goes back to an empty `+` tile.
 
 ---
 

docs/solo_features/tools_screen/tools_screen.md

@@ -253,7 +253,7 @@ The tool holds both directions of sharing in one flat list. Navigate with **UP/D
 
 <!-- screenshot pending: Locator screen with a target set (e.g. "@Bob (5m)"), radius/mode/beeper rows -->
 
-A single **geofence** that beeps and shows an alert when you cross **into** or **out of** a radius. The target can be a **saved waypoint** (a fixed place — "tell me when I'm back at camp") or a **live contact** (a person sharing their position via Live Share — "alert me when my friend gets near / falls behind"). A waypoint target is a **snapshot** (coordinate + label copied), so it keeps working even if you later edit or delete that waypoint; a contact target follows the person's latest shared position.
+A single **geofence** that beeps and shows an alert when you cross **into** or **out of** a radius. The target can be a **saved waypoint** (a fixed place — "tell me when I'm back at camp") or a **live contact** (a person sharing their position via Live Share — "alert me when my friend gets near / falls behind"). A waypoint target is a **snapshot** (coordinate + label copied), so it keeps working even if you later edit that waypoint; a contact target follows the person's latest shared position. **Deleting** the target's waypoint, or the target contact being removed from the contacts list, clears the Locator target back to `none` instead of leaving it pointed at something that's gone.
 
 Navigate with **UP/DOWN**, change a value with **LEFT/RIGHT** (or **Enter**); **Cancel/Back** saves and returns to Tools.
 

examples/companion_radio/AbstractUITask.h

@@ -73,9 +73,11 @@ public:
   virtual void onSharedLocation(const uint8_t* pub_key, const char* name,
                                 int32_t lat_1e6, int32_t lon_1e6,
                                 uint32_t ts, bool verified) {}
-  // A contact was removed (companion app / CLI command). Lets UI state that
-  // references contacts by pubkey (favourite slots, the Locator/Live Share
-  // target) drop a reference that would otherwise dangle. Default no-op.
+  // A contact is gone — removed explicitly (companion app / CLI command) or
+  // silently auto-evicted to make room when the contact table is full. Lets
+  // UI state that references contacts by pubkey (favourite slots, the
+  // Locator/Live Share target) drop a reference that would otherwise dangle.
+  // Default no-op.
   virtual void onContactRemoved(const uint8_t* pub_key) {}
   virtual void loop() = 0;
 };

examples/companion_radio/MyMesh.cpp

@@ -352,6 +352,7 @@ uint8_t MyMesh::getAutoAddMaxHops() const {
 
 void MyMesh::onContactOverwrite(const uint8_t* pub_key) {
     _store->deleteBlobByKey(pub_key, PUB_KEY_SIZE); // delete from storage
+  if (_ui) _ui->onContactRemoved(pub_key); // same cleanup as an explicit CMD_REMOVE_CONTACT
   if (_serial->isConnected()) {
     out_frame[0] = PUSH_CODE_CONTACT_DELETED;
     memcpy(&out_frame[1], pub_key, PUB_KEY_SIZE);